轮轨接触面损伤时冲击力作用下热弹塑性分析

An Analysis of Thermal Elasticoplasticity under Impact Force During Wheel-Rail Contact Surface Damage

轮轨接触面发生剥离断裂等损伤时轮轨冲击力是无损伤时的数倍,不同损伤,不同速度,不同环境温度,轮轨冲击区域温度不同.由于轮轨损伤而产生的极大的轮轨冲击力导致损伤部位应力应变极大,损伤部位温度升高,损伤附近更容易发生较大的弹/塑性变形,使损伤发生扩展.

When the wheel-rail contact surface is damaged such as peeling fracture, the impact force of wheel-rail is several times higher than that without damage. With different damages, different speeds, different ambient temperatures, the temperatures of wheel-rail impact area are different. Due to the great wheel-rail impact force caused by wheel-rail damage, the stress and strain of the damaged site is very large, the temperature of the damaged site is increased, and the larger elastic/plastic deformation is more likely to occur near the damage, which makes the damage spread.